Migrate ArcUserDataService into ArcAuthService.

chrome/browser/chromeos/arc/arc_auth_service.h

Index: chrome/browser/chromeos/arc/arc_auth_service.h
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.h b/chrome/browser/chromeos/arc/arc_auth_service.h
index 3466f886ad1a252bc28ddfc88d673d6b26ed6c4e..3e726990a9342be916c343b7cd32aafa3327d5d2 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.h
+++ b/chrome/browser/chromeos/arc/arc_auth_service.h
@@ -181,6 +181,15 @@ class ArcAuthService : public ArcService,
   // Stops ARC without changing ArcEnabled preference.
   void StopArc();
 
+  // If arc is running, StopArc(), then StartArc(). Between them
+  // data clear may happens.
+  void ReenableArc();
+
+  // Removes the data if ARC is stopped. Otherwise, queue to remove the data
+  // on ARC is stopped.
+  void RemoveArcData();
+  void OnArcDataRemoved(bool success);
+
   // Returns current page that has to be shown in OptIn UI.
   UIPage ui_page() const { return ui_page_; }
 
@@ -219,6 +228,7 @@ class ArcAuthService : public ArcService,
   UIPage ui_page_ = UIPage::NO_PAGE;
   base::string16 ui_page_status_;
   bool clear_required_ = false;
+  bool reenable_arc_ = false;
   bool waiting_for_reply_ = false;
 
   std::unique_ptr<ArcAuthContext> context_;